SI grades in various CSF spaces in healthy volunteers breathing room air or 100% O2
| CSF Space and Grade | Group | P Value | |
|---|---|---|---|
| Room Air (n = 25) | 100% O2 (n = 25) | ||
| CPA cistern | <.001 | ||
| 0 | 7 | 0 | |
| I | 16 | 3 | |
| II | 2 | 22 | |
| Ambient cistern | <.001 | ||
| 0 | 22 | 0 | |
| I | 3 | 0 | |
| II | 0 | 25 | |
| Interpeduncular cistern | <.001 | ||
| 0 | 24 | 0 | |
| I | 1 | 0 | |
| II | 0 | 25 | |
| Prepontine cistern | .004 | ||
| 0 | 1 | 0 | |
| I | 8 | 0 | |
| II | 16 | 25 | |
| Quadrigeminal cistern | <.001 | ||
| 0 | 24 | 0 | |
| I | 1 | 1 | |
| II | 0 | 24 | |
| Suprasellar cistern | <.001 | ||
| 0 | 18 | 1 | |
| I | 6 | 0 | |
| II | 1 | 24 | |
| Convexity sulci | <.001 | ||
| 0 | 25 | 1 | |
| I | 0 | 0 | |
| II | 0 | 24 | |
| Fourth ventricle | .004 | ||
| 0 | 15 | 6 | |
| I | 8 | 16 | |
| II | 2 | 3 | |
| Third ventricle | .102 | ||
| 0 | 22 | 19 | |
| I | 3 | 4 | |
| II | 0 | 2 | |
| Lateral ventricles | .317 | ||
| 0 | 21 | 21 | |
| I | 4 | 3 | |
| II | 0 | 1 | |
| Sylvian fissures | <.001 | ||
| 0 | 25 | 0 | |
| I | 0 | 0 | |
| II | 0 | 25 | |